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Orthogonal and quasi-orthogonal space-time block codes.

Author

Yuen, Chau.

Date of Issue

2006

School

School of Electrical and Electronic Engineering

Abstract

In this thesis, we first study the complex version of Amicable Orthogonal Design (AOD) called Amicable Complex Orthogonal Design (ACOD), and use it to construct O-STBCs with practical implementation advantages, such as balanced power distribution properties and rational-number code coefficients. Next, we study the decoding of QO-STBC with noise-whitening pre-filter and propose Group-Constrained Linear Transformation (GCLT) as an alternative means to optimse the QO-STBC performance without increasing its decoding complexity. We also propose a new class of QO-STBC called QO-STBC with Minimum Decoding Complexity (MDC-QOSTBC). The decoding complexity of MDC-QOSTBC is only next to O-STBC, as MDC-QOSTBC requires a joint detection of only two real symbols. In the thesis, we examine the relationship between the mathematical structures of MDC-QOSTBC and AOD, and found out that MDC-QOSTBC can be constructed from two AODs that form a Preferred AOD Pair, which is a new concept introduced in this thesis. We derive the theoretical maximum achievable code rate of MDC-QOSTBC. Finally, we also propose for the first time differential space-time modulation (DSTM) schemes based on QO-STBC and MDC-QOSTBC to provide blind transmit diversity. The DSTM scheme based on QO-STBC is double-symbol decodable, while the DSTM scheme based on MDC-QOSTBC is single-symbol decodable, hence both have very low decoding complexity.